1. No satellite signal? Check your dish for snow!

However, if it has snowed you will also find the same message. And there is nothing wrong with your box, or viewing card. This time it is the simple matter of there being snow on the dish or LNB. See more at No satellite signal? Check your dish for snow!

2. What is the Inversion Effect and why does it effect my Freeview TV reception?

When there is high atmospheric pressure (BBC Weather - UK Pressure chart) as the sun heats up the ground the warm air gets trapped underneath the colder air higher up. At the point where the warm air gets trapped under the cold air this creates a layer that is, in effect, a mirror for the television signals.

4. Seasonal tree growth is now in the way of your aerial

The TV signal needs a line-of-sight from the transmitter to your aerial and anything that gets in the way and is connected to the ground will do exactly what your aerial does and grabs a bit of the signal. In the winter the tree will absorb a little of the signal, but you can still watch TV. However, as the leaves grow they act as bigger and bigger aerials themselves and block the signals from getting to your aerial. In effect the aerial is in the "shade" of the transmitter!

5. The wind has rattled your rooftop aerial and now it's pointing the wrong way

If it's been windy, you might find that the Freeview signal is not working. It is also sensible to check that your aerial has not been moved or damaged by wind or weather as first step.

For good reception, the roof top aerial should be pointing directly at the transmitter mast. If, for some reason, it no longer is you will need to replace it. For safety reasons, you should use a professional: falling from roof-height is invariably fatal.

7. Your aerial has been hit by lightening

A lightning bolt hit a house in Bolton, blowing a hole in the roof before it travelled down the chimney, exploded in the fireplace and "melted" the curtains.

Margaret Hart, 70, and her husband had to stay with a neighbour after the strike destroyed the fuse box and blew light switches off the walls.

8. The TV transmitter has iced up ... and fallen down

"if you had been watching BBC North television forty years ago, you might remember this happening to your picture! Screens across Yorkshire went blank after the one thousand two hundred foot tall transmitter collapse in icy weather"

9. An extremely powerful solar flare destroys all the satellites around the world

"When aimed directly at Earth, major solar flares and coronal mass ejections can pose a threat to astronauts and satellites in orbit. They can interfere with GPS navigation and communications satellite signals in space, as well as impair power systems infrastructure on Earth."

Please could you tell us what the signal strengths are as reported by your TV set. It is best if the SD channels have between 50% and 85% whilst HD ones should ideally be between 60% and 85%. It would be worth comparing those figures during the day and in the evening while the problems occurs.

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